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Inventories, Net
12 Months Ended
Sep. 30, 2019
Inventory, Net [Abstract]  
Inventories, Net
4.  Inventories, Net

The table below summarizes the types and amounts of TVA's inventories:
Inventories, Net 
At September 30
 
2019
 
2018
Materials and supplies inventory
$
742

 
$
725

Fuel inventory
294

 
266

RECs/Emission allowance inventory, net
16

 
14

Allowance for inventory obsolescence
(53
)
 
(44
)
Inventories, net
$
999

 
$
961